<form action="" method="post">
  <p><input name="modo" type="hidden" id="modo" value="2" />Cognome
    <input type="text" name="Cognome" id="Cognome">
  </p>
  <p>Nome 
    <input type="text" name="nome" id="nome">
  </p>
  <p>indirizzo 
    <input type="text" name="Indirizzo" id="Indirizzo">
  </p>
  <p>
    <input type="submit" name="button" id="button" value="Invia">
  </p>
</form>
